Enigma 1:
Christmas Perl
Enigma 2:
Santa's Broken Stick
Enigma 3:
Mathematicians' Digital Clock
Enigma 4:
Elves' Sleigh Seats
Enigma 5:
Best Power of Two
Enigma 6:
Elves' Shuffling
Enigma 7:
Santa's Gift Distribution Order
Enigma 8:
Inès's Linear Regression
Enigma 9:
Mystery Number
Enigma 10:
Math in Cinema